RIP Astrologian

[Zfz]

And what does the sentence right after that say? Because that's where google is getting a "likely."

Translated it says:

But note that you cannot switch (stances) during battle. So you should probably look at your party composition and make the switch in advance.

in the same way we say:

But note that you cannot jump off a running train. So you should probably look at where you want to go and prepare to unboard the train before it reaches your station.